Very low gas velocity can reduce droplet inertia and make fine droplets more likely to follow gas streamlines through a mist eliminator. Demister selection should therefore consider minimum, normal, and maximum gas-flow cases rather than only the maximum design velocity.

Liquid density affects droplet inertia, viscosity affects drainage and liquid holdup, and surface tension affects droplet formation, wetting, coalescence, and re-entrainment. These properties can materially change mist eliminator performance even when gas flow and droplet size remain unchanged.

Real process mist contains a distribution of droplet sizes, not one uniform diameter. Fine droplets can dominate downstream carryover even when average droplet size appears favorable, so mist eliminator selection should consider the full droplet population and how it is generated.

Wire diameter affects wire length, collecting surface, pressure drop, drainage, mechanical strength, and fouling tolerance in a wire mesh mist eliminator. It should always be evaluated together with mesh density, void fraction, pad thickness, and process conditions.

Void fraction describes the open volume inside a wire mesh mist eliminator. It influences gas capacity, pressure drop, liquid drainage, and fouling tolerance, and should be considered together with mesh density, wire diameter, pad thickness, and process load.